Defending champion Garbine Muguruza, the French Open champion who is seeded second, beat Yulia Putintseva 6-2, 7-6 (5) in the second round.

"I'm very happy I could close the match in the tiebreak because obviously it was getting tougher and tougher," Muguruza said. "Tiebreaks are moments where it's delicate. You feel a bit more nervous and more tense."